LiftMaster code 1-2
The door won’t close because a sensor wire is shorted
Check this first, then a proSomewhere along the sensor wiring, two wires touch or are connected the wrong way round. A staple pinching the wire is a common cause.
What to do: Check the sensor wire wherever it is stapled or joined. Replace a damaged piece of wire, or have a pro do it.
From the maker’s manuals:
- LiftMaster manual, PDF page 43 for the 8160W and 5 more models
- LiftMaster manual, PDF page 36 for 8587W and 8587WL
- LiftMaster manual, PDF page 38 for 8360W
- LiftMaster manual, PDF page 32 for 8500WMC and 8500WMC-267
- LiftMaster manual, PDF page 44 for the 87504-267 and 4 more models
Which models each manual covers
- LiftMaster manual for models 8160W, 8160WB, 8164W, 8165W, 8365W-267, 8155W
- LiftMaster manual for models 8587W, 8587WL
- LiftMaster manual for model 8360W
- LiftMaster manual for models 8500WMC, 8500WMC-267
- LiftMaster manual for models 87504-267, 84504R, 84505R, 87802, 84602
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Garage Door Science isn’t affiliated with the opener makers LiftMaster, Chamberlain or Genie. Each meaning is our summary of the maker’s own manual, which we link.
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